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Full text of "The Morphology And Evolution Of The Apes And Man"

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230
MOEPHOLOGY AND EVOLUTION
following account of the arteries in the Chimpanzee is generally applicable to the other Apes.
The superior thyroid artery (fig. 42 S.T.A.) describes the usual downward curve. It anastomoses with the other thyroid arteries, and supplies the gland and the p.retracheal muscles.
5-H.M.
L.F.T.
FIG. 42.—Arteries of the head and neck in the Chimpanzee. C.C.A. and B.C.A., common and external carotid arteries ; E.U.A., facial artery ; H.B., hyoid bone ; I.T.A., il.T.A. and S.T.A., inferior, middle and superior thyroid arteries; l.T.Y. and S.T.Y., inferior and superior thyroid veins ; L.F.T., linguo-facial truuk ; O.A., occipito auricular trunk ; 0"H.3IM omo-hyoid muscle ; S.H.M. and S.T.M., sterno-hyoid and stenio-fehyroid muscles; T.H.il., thyro-hyoid muscle; T.G., thyroid gland; T.I.A., thyroidea ima artery; T,M.A., temporo-maxillary artery; T.P.B., thymic-parathyroid mats ; XII, hypoglossal nerve.
The lingual artery runs forwards between the hyo-glossns and the middle constrictor of the pharynx. It then sinks into the genio-glossus muscle and passes